Parker COSE Change over system Manifolds/change over regulator also known as Gas bottle change over system are designed to meet the requirements of a wide range of industrial applications Gas bottle change over, Process and purging applications, Emission analyzis, Laser gas systems, Gas and liquid chromatography, Specialty gases. The key features of the Parker COSE Change over system Manifolds/change over regulator are Allows change out of depleted cylinder(s) while maintaining gas flow, Especially suited for continuous on-stream analyzers, The COSE maintains a continuous gas delivery from two separate sources allowing for maximum cylinder gas usage from one source before automatically switching to the second source.